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Polarographic Determination of Formaldehyde According to the Anodic Oxidation Wave in Alkaline Solutions
Author(s) -
Norkus Eugenijus,
Vaskelis Algirdas,
Pauliukaite Rasa
Publication year - 1999
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199905)11:6<447::aid-elan447>3.0.co;2-3
Subject(s) - polarography , limiting current , diffusion current , chemistry , tartrate , formaldehyde , peak current , copper , analytical chemistry (journal) , diffusion , limiting , ion , square wave , plating (geology) , electrochemistry , inorganic chemistry , electrode , chromatography , current (fluid) , voltage , thermodynamics , organic chemistry , mechanical engineering , physics , quantum mechanics , geophysics , engineering , geology
The polarographic waves of CH 2 O oxidation in 2–3 M NaOH solutions containing 0.04–0.10 M (+)‐tartrate are diffusion controlled: the dependences of limiting current ( i lim ) on the square root of the Hg column height are linear and the temperature coefficient of the limiting current is relative small, i.e., ∼2% grad –1 . The anodic waves of CH 2 O oxidation could be used for analytical purposes. i lim is proportional to CH 2 O concentration in the range 2×10 –4 –4×10 –3 M. The precision of CH 2 O determination is typical for DC‐polarography. A RSD smaller than 3 % has been obtained for 20–200 μmol; CH 2 O. The method proposed is suitable for the direct determination of formaldehyde in electroless copper plating solutions containing (+)‐tartrate or glycerol as Cu(II) ions ligands.